A parallel beam of sodium light of wavelength 5890 Å is incident on a thin glass plate of…
Physics · Class 12 · CBSE — Wave Optics
A parallel beam of sodium light of wavelength 5890 Å is incident on a thin glass plate of refractive index 1.5 such that the angle of refraction in the plate is 60°. The smallest thickness of the plate which will make it dark by reflection
- 3926 Å
- 4353 Å
- 1396 Å
- 1921 Å
Answer
(D) 1921 Å
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